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ART OF MAKING EVAPORATING' FANS-r I NO. 316,893.

{No Model.)

- Patented Apr 2 1885.

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Patented Apr. 28, 1885.

V UNIT-ED STATES PATENT Price.

GUSTAVE H.'GRIMM, OF HUDSON, OHIO.

ART OF MAKING EVAPORATlNG-PANS.

SPECIFICATION forming part of Letters Patent No. 316,393, dated Aprii 28, 1885.

Application filed March 20, 1884. (No model.)

' that have what is known to the trade as corrug-atedbottomsfiand more especially to a process of folding the metal at the ends of the corrugations, the object being after corrugating or forming a portion of the metal sheet for the bottom of the pan into a series of inverted troughs extending from end to end of the sheet to slit the sheet from the ends inward a suitable distance along the line of the troughs at what will be the bottom plane of the pan and folding the metal downward and inward so as to extend transversely across the troughs and form, respectively, ends therefor, to the end that no joints or soldered seams are had except at the bottom of the pan, when in case of low liquid in the pan the joints are likely still to be protected.

A further object is to provide a continuous strip extending the width of the pan and from the ends of the troughs, after folding aforesaid, to the adjacent side of the pan, and the said strip provided with tongues extending up inside of the said folded ends to re'enforce the same and protect these ends from the heat.

With these objects in view my invention consists in a process of forming the ends of the troughs, the different steps of which are hereinafter described, and pointed outin the claims.

Heretofore in the construction of evaporating-pans the usual manner of closing the ends of these troughs was by soldering in a sepa- 'rate piece. In operating these pans the best results in the way of rapid evaporation are attained when but little liquid is had therein and the tops of the troughs have only a shallow covering. From inattention or other causes the top of the ridges may become bare, in which case any soldered joint would be injured in a few minutes, which in the hurrying time of sugar making would involve a serious loss. 1 have therefore invented a process of forming ends or heads to the inverted troughs by folding the metal downward and inward in such a manner that no seams or soldered joints are had except at the bottom of the pan.

In the accompanying drawings, Figures 1 and 3 are views in perspective of portions of triangular troughs formed on the bottom sheet of the pan which illustrate the manner of folding the metal to form the ends of the troughs. Fig. 6 is a view in perspective of portions of rectangular troughs which illustrates the manner of folding the metal to form the ends thereof. Figs. 2, 4, and 7 are views in perspective of end pieces for closing the openings in the bottom of the pans at the respective ends of the troughs having tongues for extending upward inside of the troughs next the folded ends. Fig. 5 is a view in perspective of a completed pan with portions of the sides broken away to show the construction inside. Figs. 8 to 13, inclusive, are diagrams showing in horizontal section the different manners of folding the metal sheet in forming the ends of the troughs. Fig. 14 is a view in perspective of a sheet of metal for the bottom of a pan after it has been bent to form the troughs. Fig. 15 is a view in perspective of the sheet shown in Fig. let after the sheet has been slitted at the ends of the troughs and the metal folded to form heads or end pieces for said troughs.

In manufacturing. these pans a sheet of metal of suitable size for the bottom of the pan is first corrugated-that is, bent so as to form inverted troughs, either triangular or rectangular in cross-section, as may be preferred, but in either case extending the length of the sheet, as shown in Fig. 14. The sheet with troughs A or B, as the case may be, is next slitted at either end a suitable distance along the bottom edges of the troughs on the lines a b, and the metal is then folded to form transverse heads or ends to the troughs, leaving gaps or openings in front of each end of every trough, as shown in Fig. 15. These openings of course have to be closed to complete the bottom of the pan, and for this purpose I use a continuous strip of metal respectively at each end of the pans that is secured underneath and closes all of the said openings at the one end of the pan and has tongues that extend up inside along the folded end and more or less protect the latter from the heat. With the triangular troughs shown in Figs. 1 and 2 the ends of the troughs at the apex before folding is at 0 and after folding at 0. One side or the other, it matters not which, is folded downward and inward on the line b c, and the opposite side on the line a c is folded together, either outward or inward, as preferred, and the folded parts are then'brought together, forming a transverse vertical head or end to the trough. In Fig. 1, trough A the left-hand side is shown bent downward and to the right hand, and the right-hand side is first bent outward and doubled on the line a 0. (See also diagram Fig. 11.) Afterwards this right-hand side, already doubled, as aforesaid, is bent downward to the left hand and brought on the outside of the head, as shown in Fig. 12.

In Fig. 3, trough A, the right-hand side is bent downward and to the left hand, while the left-hand side is bent inward and afterwards bent to the right hand and on the inside of the head, as shown in Fig. 13. In either case the result is there are no seams or soldcredjoints except at the bottom of the pan. The folded end or head is bent on the line b b, and the lower half is brought forward on a horizontal plane and made to form a part of the bottom of the pan at the ends of the troughs. (See Figs. 1 and 3, troughs A and A The rectangular troughs B are slitted on the line a b at the base, the same as with the triangular troughs just described, and the different stages of folding are shown more clearly in Fig. 6. The top and end portions of the trough B are bent down on the line d e to the vertical position shown in trough B, that necessitate reversing the bends along the lines 9 d and e f(trough B) and folding the sides diagonally on the line (I a and c a. (See t1 ough B, and see also diagram Fig. 8.) Next the sides, already folded diagonally, as aforesaid, are bent inward or toward each other, first the one side, as shown in Fig. 9, and then the other, as shown in Fig. 10, thus completing the folding of the heads, as shown in Fig. 15, and at the right hand in Fig. 6. After the ends of the troughs are folded formin g heads, as aforesaid, there will remain openings, rectangular or triangular, according to the variety of the troughs, extending along the ends of the troughs, the former variety being shown clearly in Fig. 15. To close these I use a continuous strip of metal at the respective ends of the pan. These strips are applied on the under side and have tongues that extend up on the inside of the troughs next to the heads.

The strips K, provided with the tongues 70, as shown in Figs. 2 and 4, are suitable for the pans with triangular corrugations, and the strip L, provided with tongues l, and for the rectangular troughs. These strips are usually riveted to hold them in place, and afterward soldered to form tight joints. The sides M (shown in Fig. 5) are afterward added to complete the pan. The bottom sheet for one of these pans is preferably in one piece; but if thisis not practicable with the material athand two or more sheets may be joined together lengthwise of the corrugations, but with the seams arranged between the troughs along the bottom of the pan.

What I claim is 1. In evaporating-pans having what is known as corrugated bottoms, the process or method herein described of forming ends or heads for the troughs. consisting, essentially, in slitting the ends of the metal sheet a suitable distance along the bottom edges of the troughs and folding the metal downward and inward in such a manner that transverse heads are formed without joints-0r soldered seams, except at the bottom of the pan, substantially as set forth.

2. In evaporating-pans having what is known as corrugated bottoms, the process or method herein described of forming ends or heads for the troughs, consisting, essentially, in slitting the ends of the metal sheet a suitable distance along the bottom edges of the troughs and folding the metal downward and inward in such a manner that transverse heads are formed without joints or'soldered seams, except at the bottom of the pan, and re-enforcing the folded heads on the inside, respectively, with metal strips or tongues integral with and held in position by horizontal sheets secured to the bottom of the pan, substantially as set forth.

In testimony whereof I sign this specification, in the presence of two witnesses, this 11th day of February, 1884.

GUSTAVE H. GRIMM. Witnesses J. ANDREW, T. F. TURNER. 

